How about setting max_features=int(1)?
This is a good reference for Numerai Tournament;
https://poseidon01.ssrn.com/delivery.php?ID=029123122124116016116079103000088086046017064042000030023121064104123102009109030098059042125003033000013011018067017083069092045061037061029013099121103079098068046061084090104007105026069123066115104022026082067025122108023065086113079113019101024&EXT=pdf&INDEX=TRUE
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